Answer:
a) 3.16s
b) 10m
Explanation:
Let g = 10m/s2. Gravity and normal forces acting on the box:
N = G = mg= 20*10 = 200 N
The static friction acting on the box is
Kinetic friction acting on the box is:
When the truck accelerates from rest, this acceleration would generate an inertia force on the box
Since the box is definitely moving with respect to the truck with a net force of
So then the net acceleration of the box with respect to the truck is
a) the distance to the rear truck is 5m, then the time it takes for the box to accelerate and reach that point is
b) The distance travelled by the truck when it starts from rest:
Answer:
= 128.3 J / kg ° C
Explanation:
In this exercise we will use that the expression for heat is
Q = m ΔT
As they indicate that there are no losses with the medium, the heat transferred by the tungsten is equal to the heat absorbed by the water plus the calorimeter
Q assigned = QAbsorbed
Q hot = Q cold + Q calorimeter
The mass of tungsten (m₁ = 69.12 10⁻³ kg) with an initial temperature (T₁ = 98.93°C),
The mass of water (m₂ = 85.45 10⁻³ kg) at a temperature (T₂ = 23.82°C),
a calorimeter constant (C = 1.56 J/ °C)
m₁ (T₁ - ) = (m₂ + C) ( - T₂)
= (m₂ ce2 + C) (-T₀) / (m₁ (T₁-)
= (85.45 10-3 4186 + 1.56) (25.63 - 23.82) / (69.12 10-3 (98.93 - 25.63))
= (357.69 + 1.56) 1.81 / (69.12 10-3 73.3)
= 650.24 / 5.0665
= 128.3 J / kg ° C
Answer:
1.29 m
Explanation:
Net force acting on the dog, will be given by
where m is mass and g is acceleration due to gravity
Since the work done by the net force against the ground equals the final potential energy
Height which the dog can jump,
H=0.6+0.44=1.04 m
Total height to reach=Height to jump+ half height of the dog
=1.04 m+0.5(0.5 m)=1.29 m
The correct answer is A:) hope it helps :0
Answer:
a) , b)
Explanation:
a) Let consider two equations of equilibrium, the first parallel to ski slope and the second perpendicular to that. The equations are, respectively:
The force on the skier is:
b) The equations of equilibrium are the following:
The force on the skier is: